### Abstract

The near-field gap effects are investigated in planar dielectric microdisc and waveguide coupling structures, emphasizing miniaturization of integrated sensor systems. The simulation results show that the resonance frequency is not obviously affected by the gap dimension when the gap between a microcavity and its coupler is larger than 300 nm. However, the resonance frequency shifts observably with a further decreasing gap to the nanometre level. This shift is generally larger than the cavity resonance linewidth in the 10 νm diameter microdisc system, but is comparable to the cavity resonance linewidth in the 2 νm diameter microdisc system. With increasing gap, the cavity Q increases exponentially until it is saturated at a limit Q factor. An optimal gap dimension exists for maximum light energy transfer and storage. The concept of optimum gap is introduced and defined at the gap dimension where half-maximum energy storage capability is achieved; meanwhile, the cavity Q is high and the resonance frequency remains stable.

Original language | English (US) |
---|---|

Article number | 006 |

Pages (from-to) | 5133-5136 |

Number of pages | 4 |

Journal | Journal of Physics D: Applied Physics |

Volume | 39 |

Issue number | 24 |

DOIs | |

State | Published - Dec 21 2006 |

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### ASJC Scopus subject areas

- Physics and Astronomy (miscellaneous)

### Cite this

*Journal of Physics D: Applied Physics*,

*39*(24), 5133-5136. [006]. https://doi.org/10.1088/0022-3727/39/24/006

**Near-field gap effects on small microcavity whispering-gallery mode resonators.** / Guo, Zhixiong; Quan, Haiyong; Pau, Stanley K H.

Research output: Contribution to journal › Article

*Journal of Physics D: Applied Physics*, vol. 39, no. 24, 006, pp. 5133-5136. https://doi.org/10.1088/0022-3727/39/24/006

}

TY - JOUR

T1 - Near-field gap effects on small microcavity whispering-gallery mode resonators

AU - Guo, Zhixiong

AU - Quan, Haiyong

AU - Pau, Stanley K H

PY - 2006/12/21

Y1 - 2006/12/21

N2 - The near-field gap effects are investigated in planar dielectric microdisc and waveguide coupling structures, emphasizing miniaturization of integrated sensor systems. The simulation results show that the resonance frequency is not obviously affected by the gap dimension when the gap between a microcavity and its coupler is larger than 300 nm. However, the resonance frequency shifts observably with a further decreasing gap to the nanometre level. This shift is generally larger than the cavity resonance linewidth in the 10 νm diameter microdisc system, but is comparable to the cavity resonance linewidth in the 2 νm diameter microdisc system. With increasing gap, the cavity Q increases exponentially until it is saturated at a limit Q factor. An optimal gap dimension exists for maximum light energy transfer and storage. The concept of optimum gap is introduced and defined at the gap dimension where half-maximum energy storage capability is achieved; meanwhile, the cavity Q is high and the resonance frequency remains stable.

AB - The near-field gap effects are investigated in planar dielectric microdisc and waveguide coupling structures, emphasizing miniaturization of integrated sensor systems. The simulation results show that the resonance frequency is not obviously affected by the gap dimension when the gap between a microcavity and its coupler is larger than 300 nm. However, the resonance frequency shifts observably with a further decreasing gap to the nanometre level. This shift is generally larger than the cavity resonance linewidth in the 10 νm diameter microdisc system, but is comparable to the cavity resonance linewidth in the 2 νm diameter microdisc system. With increasing gap, the cavity Q increases exponentially until it is saturated at a limit Q factor. An optimal gap dimension exists for maximum light energy transfer and storage. The concept of optimum gap is introduced and defined at the gap dimension where half-maximum energy storage capability is achieved; meanwhile, the cavity Q is high and the resonance frequency remains stable.

UR - http://www.scopus.com/inward/record.url?scp=33846857789&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33846857789&partnerID=8YFLogxK

U2 - 10.1088/0022-3727/39/24/006

DO - 10.1088/0022-3727/39/24/006

M3 - Article

AN - SCOPUS:33846857789

VL - 39

SP - 5133

EP - 5136

JO - Journal Physics D: Applied Physics

JF - Journal Physics D: Applied Physics

SN - 0022-3727

IS - 24

M1 - 006

ER -